442401021 has 20 divisors (see below), whose sum is σ = 689607072. Its totient is φ = 282109608.

The previous prime is 442400983. The next prime is 442401053. The reversal of 442401021 is 120104244.

It is a de Polignac number, because none of the positive numbers 2^k-442401021 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 442400985 and 442401003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (442401121) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 116871 + ... + 120596.

Almost surely, 2^442401021 is an apocalyptic number.

It is an amenable number.

442401021 is a deficient number, since it is larger than the sum of its proper divisors (247206051).

442401021 is a wasteful number, since it uses less digits than its factorization.

442401021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 237502 (or 237493 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 18.

The square root of 442401021 is about 21033.3311912307. The cubic root of 442401021 is about 761.9714633743.

Adding to 442401021 its reverse (120104244), we get a palindrome (562505265).

The spelling of 442401021 in words is "four hundred forty-two million, four hundred one thousand, twenty-one".